A hot lion with a very bloated stomach ... will adopt either a sphinxed or a squatting posture which takes some of the weight off its belly.
3
To be inscrutable, often through silence
(1900) The sphinxèd riddle of the Universe / Nature's unsolved enigma, who may prove?
4
To make one guess at the unknowable
(1933) Perhaps Nature is sphinxing us on purpose. Whatever her objects may be, perhaps she gets her work done better when she appeals to our gambling instincts. If you knew for certain exactly how your marriage was going to turn out ...